How to denoise audio with SOX?

Question

Givent a audio.wav recording with silence at both start and end for at least 1second...

How to denoise with SOX ?

Answer 1

What is SOX

• SoX - Sound eXchange, the Swiss Army knife of audio manipulation

Create noise file from input audio's initial 0.9s silence + room's noise

# sox in.ext out.ext trim {start: s.ms} {duration: s.ms}
sox audio.wav noise-audio.wav trim 0 0.900

Generate a noise profile in sox:

sox noise-audio.wav -n noiseprof noise.prof

Clean the noise from the audio

sox audio.wav audio-clean.wav noisered noise.prof 0.21

According to source :

Change 0.21 to adjust the level of sensitivity in the sampling rates (I found 0.2-0.3 often provides best result).

Sources

• How To Do Noise Reduction Using ffmpeg And sox